About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Aluminum Reduction Technology
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Presentation Title |
The Influence of Calcium Fluoride on Entrainment of Electrolyte during Metal Siphoning |
Author(s) |
Curtis Landon, Stephen Lindsay, Brian Zukas |
On-Site Speaker (Planned) |
Curtis Landon |
Abstract Scope |
Use of Calcium Fluoride as an additive to the electrolyte for primary Aluminum reduction goes back to the earliest days of the Hall-Héroult process. It reduces the liquidus temperature of cryolitic electrolyte, thus enabling lower operating temperatures which has associated benefits. It is stable as an additive that remains in the electrolyte and does not leave in significant levels via off-gas or with the aluminum metal that is produced. It’s negative impacts on alumina solubility and electrical conductivity are acceptable when the Calcium Fluoride content of bath is kept at an average of 4.5 to 6.5 wt.%. Calcium Fluoride also increases the specific gravity of the electrolyte, imposing a practical limit on its upper concentration. This paper focuses on observations related to increases in Calcium Fluoride content in electrolyte and the amounts of electrolyte tapped with aluminum removed from reduction cells by siphoning.
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Proceedings Inclusion? |
Planned: Light Metals |
Keywords |
Aluminum, Electrometallurgy, |